class Person:
    def __init__(self,name,weight):
        self.name = name
        self.weight = weight

    def __str__(self):
        return "我的名字叫%s 体重%.2f公斤"%(self.name,self.weight)

    def run(self):
        print("%s爱跑步，跑步锻炼身体"%self.name)
        self.weight -= 0.5

    def eat(self):
        print("%s是吃货，吃完这顿再减肥"%self.name)
        self.weight += 1
xiaoming = Person("小明",75)

xiaoming.run()
xiaoming.eat()

print(xiaoming)
